Lay tortillas out on a flat work surface and mound 1/3 cup bean mixture onto centre of each. Arrange 3 pieces of halibut in a single layer on top of bean mounds. Roll each tortilla to enclose filling but keep ends open. Arrange filled tortillas, seam sides down, in 1 layer in prepared casserole dish. Sprinkle with cheese and bake, covered with aluminum foil, for 10 minutes. Then remove foil and continue baking until burritos are crispy and cheese is golden brown, about 15 minutes more. Serve burritos with sour cream or salsa, if desired.

Nutritional Bonus: Selenium is a trace mineral that actually combines with proteins in the body to create antioxidant enzymes called selenoproteins. The mineral also plays a role in regulating the function of the thyroid gland and immune system. Thanks to the halibut and brown rice, this burrito casserole offers over a quarter of your day’s selenium. Other rich sources include Brazil nuts, button and shiitake mushrooms, cod, shrimp, liver and salmon! 🙂